Abstract：Lattice structures are increasingly utilized in aerospace, automotive manufacturing, and biomedical fields due to their advantages of lightweight construction, excellent sound insulation, high specific strength, high specific stiffness, and superior vibration absorption properties. To investigate the relationship between gradient strategies and the mechanical response of gradient lattice structures, this study designed gradient lattice structures with different gradient strategies and fabricated corresponding specimens using selective laser melting technology. The compressive properties of these structures were systematically investigated through a combined approach of simulation and experimental validation. The results indicate that during compression, the nodes of the lattice cells serve as primary stress concentration locations. Uniform structures, unidirectional gradient structures, and bidirectional gradient structures exhibit distinct deformation behaviors. Gradient lattice structures exhibit higher elastic modulus, yield strength, compressive strength, and plateau stress compared to uniform structures. Furthermore, bidirectional gradient structures demonstrate superior mechanical properties over unidirectional gradient structures and superior energy absorption performance compared to both uniform and unidirectional gradient structures. This study provides technical support for predicting the compressive response of diverse gradient lattice structures.
[1] LIU J, CHEN T T, ZHANG Y H, et al.On sound insulation of pyramidal lattice sandwich structure[J]. Composite Structures, 2019, 208: 385-394. [2] CHEN L Y, LIANG S X, LIU Y J, et al.Additive manufacturing of metallic lattice structures: unconstrained design, accurate fabrication, fascinated performances, and challenges[J]. Materials Science and Engineering R-Reports, 2021, 146: 100648. [3] 陶斯嘉, 王小锋, 曾婧, 等. 点阵材料及其3D打印[J]. 中国有色金属学报, 2022, 32(2): 416-444. TAO Sijia, WANG Xiaofeng, ZENG Jing, et al.Lattice materials and its fabrication by 3D printing: a review[J]. The Chinese Journal of Nonferrous Metals, 2022, 32(2): 416-444. [4] ZHANG L, CHEN Y F, HE R J, et al.Bending behavior of lightweight C/SiC pyramidal lattice core sandwich panels[J]. International Journal of Mechanical Sciences, 2020, 171: 105409. [5] ARIFF Z M, AFOLABI L O, SALMAZO L O, et al.Effectiveness of microwave processing approach and green blowing agents usage in foaming natural rubber[J]. Journal of Materials Research and Technology, 2020, 9(5): 9929-9940. [6] SHARP K, MUNGALOV D, BROWN J.Metallic cellular materials produced by 3D weaving[J]. Procedia Materials Science, 2014, 4: 15-20. [7] DONG L, DESHPANDE V, WADLEY H.Mechanical response of Ti-6Al-4V octet-truss lattice structures[J]. International Journal of Solids and Structures, 2015, 60: 107-124. [8] ZHANG T L, LIU C T.Design of titanium alloys by additive manufacturing: a critical review[J]. Advanced Powder Materials , 2022, 1(1): 100014. [9] GUO N N, LEU M C.Additive manufacturing: technology, applications and research needs[J]. Frontiers of Mechanical Engineering, 2013, 8(3): 215-243. [10] YUAN L, DING S L, WEN C E.Additive manufacturing technology for porous metal implant applications and triple minimal surface structures: a review[J]. Bioactive Materials, 2019, 4: 56-70. [11] ZHANG X, WANG Y J, DING B, et al.Design, fabrication, and mechanics of 3D micro-/nanolattices[J]. Small, 2020, 16(15): 1902842. [12] YANG F Y, ZHAO S, CHEN G B, et al.High-strength, multifunctional and 3D printable mullite-based porous ceramics with a controllable shell-pore structure[J]. Advanced Powder Materials, 2024, 3(1): 100153. [13] MIAO X, HU J X, XU Y Y, et al.Review on mechanical properties of metal lattice structures[J]. Composite Structures, 2024, 342: 118267. [14] GE J G, HUANG J, LEI Y P, et al.Microstructural features and compressive properties of SLM Ti6Al4V lattice structures[J]. Surface and Coatings Technology, 2020, 403: 126419. [15] PŁATEK P, SIENKIEWICZ J, JANISZEWSKI J, et al. Investigations on mechanical properties of lattice structures with different values of relative density made from 316L by selective laser melting (SLM)[J]. Materials, 2020, 13(9): 2204. [16] LI D M, QIN R X, XU J X, et al.Improving mechanical properties and energy absorption of additive manufacturing lattice structure by struts’ node strengthening[J]. Acta Mechanica Solida Sinica, 2022, 35(6): 1004-1020. [17] DONG G Y, TANG Y L, LI D W, et al.Design and optimization of solid lattice hybrid structures fabricated by additive manufacturing[J]. Additive Manufacturing, 2020, 33: 101116. [18] AL-SAEDI D S J, MASOOD S H, FAIZAN-UR-RAB M, et al. Mechanical properties and energy absorption capability of functionally graded F2BCC lattice fabricated by SLM[J]. Materials & Design, 2018, 144: 32-44. [19] RODRIGO C, XU S Q, DURANDET Y, et al.Quasi-static and dynamic compression of additively manufactured functionally graded lattices: experiments and simulations[J]. Engineering Structures, 2023, 284: 115909. [20] CHEN C R, MA J F, LIU Y M, et al.Compressive behavior and property prediction of gradient cellular structures fabricated by selective laser melting[J]. Materials Today Communications, 2023, 35: 105853. [21] XIAO L J, SONG W D.Additively-manufactured functionally graded Ti-6Al-4V lattice structures with high strength under static and dynamic loading: experiments[J]. International Journal of Impact Engineering, 2018, 111: 255-272. [22] MASKERY I, ABOULKHAIR N T, AREMU A O, et al.Compressive failure modes and energy absorption in additively manufactured double gyroid lattices[J]. Additive Manufacturing, 2017, 16: 24-29. [23] HAN C J, LI Y, WANG Q, et al.Continuous functionally graded porous titanium scaffolds manufactured by selective laser melting for bone implants[J]. Journal of the Mechanical Behavior of Biomedical Materials, 2018, 80: 119-127. [24] BAI L, YI C Y, CHEN X H, et al.Effective design of the graded strut of BCC lattice structure for improving mechanical properties[J]. Materials, 2019, 12(13): 2192.
2025, Vol. 30 
